Osmotic Shock

Osmotic shock.
Most fish regulate how "wet" their bodies are through active osmosis, this basically means that they have the ability to pump water in or out of their bodies to match their current conditions, ...

Mainly because we want to add rotifers to our fish larvae grow out tanks and any wide differences (anything greater than 0.007 units) between specific gravity of your rotifer culture and your larvae grow out tanks can result in osmotic shock to the ...

This can lead to the loss of electrolytes through the gills, sometimes called osmotic shock. Osmotic shock interrupts healthy gill function by reducing the intake of oxygen and the release of carbon dioxide and ammonium from the fish.

What Hyposalinity Kills - The Effects of Osmotic Shock Therapy (O.S.T.) on ...
neon tetra disease - a definition of the aquarium term neon tetra disease
Saltwater Aquarium Fish Disease Trouble Shooter ...

You cannot do a large-scale change without risk of osmotic shock to the fish. In that same situation, the pH and KH of the tap (source water) is likely far higher than the tank as well. That tank is in OTS, or Old Tank Syndrome.

Water chemistry diseases- pH Shock, Acidosis, Alkalosis, Osmotic Shock
Gas diseases - CO2, Gas Bubble, Hypoxia (oxygen starvation).
Shock and stress diseases ...

See also: Feeding, Gallon, Water, Fish, Salinity